Dummynet Pipes

[Colin Watson]

I've got a question about dummynet pipes, basically I've installed two rules per user to control their traffic flow: 

add 150 pipe 15 ip from 78.77.76.21 to any out
pipe 15 config bw 512Kbit/s queue 10
add 160 pipe 16 ip from any to 78.77.76.21 in
pipe 16 config bw 512Kbit/s queue 10

However, the first (outbound traffic) rule is not kicking in. And the users can upload at whatever capcity is on the backbone. Just wondering if I've configured it correctly, or if something is missing - Any help appericated.

Colin